Heating mat for a surface heating system, surface heating system for heating a room of a building and method for producing a heating mat for a surface heating system

ABSTRACT

The invention relates to a heating mat (4) for a surface heating system (1.1), particularly for heating a room (101) of a building (100), comprising a flexible base unit (10) that has a first carrier element (11) with a planar extension and a first main side (11.1) and a second main side (11.2), and at least one electric heating means (20) for discharging heat. The invention further relates to a surface heating system (1.2) and to a method (200) for producing a heating mat (4).

The invention relates to a heating mat for a surface heating system, in particular for heating a room of a building, a surface heating system for heating a room of a building and a method for producing a heating mat for a surface heating system, in particular for heating a room of a building.

Heating systems for buildings are generally known from the prior art. Usually heaters are arranged on a wall of a building or pipes are laid as a floor heating system. Compared to heaters arranged on the wall, floor heating systems, for example, have the advantage that they can be arranged underneath a floor covering and are therefore out of sight for people. Furthermore, when the floor heating system is installed, the entire room or essentially the entire room can be heated over the surface, while individual heaters on the wall concentrate the heat in a specific area.

In the case of floor heating systems, it is also common practice to lay pipes in a meandering pattern within the floor, wherein, for example, when the floor heating system is in operation, tempered water flows through the pipes to release the heat to the room. However, the disadvantage of such water carrying floor heating systems is that the installation of the floor heating system in the floor is complex and requires complex work steps to adapt to certain geometries of the room, such as bay windows. For example, suitably cut pipe sections must be selected and connected to each other in a fluid-tight manner.

As an alternative to water carrying floor heating systems, it is also known to use electric floor heating systems, wherein such electric floor heating systems are energized and thus produce heat waste which is used to heat the room. For this purpose, cables are usually laid inside the room. However, it is often necessary for the installer on site to lay the cables evenly, as otherwise there may be areas of concentrated heat emission and areas with lower heat emission, for example. Therefore, a high degree of skill and experience is required for the installer to arrange such a cable in the room. Particularly in the case of complicated room geometries, the demands on the installer can therefore increase. At the same time, the installation costs for the laying of such floor heating systems can be high.

It is thus an object of the present invention to at least partially eliminate the above disadvantages known from the prior art. In particular, it is an object of the present invention to provide, in a cost-effective manner, a surface heating system with easy installation and preferably improved functionality.

The above-mentioned object is solved by a heating mat with the features of claim 1, a surface heating system with the features of claim 41 and a method for producing a heating mat with the features of claim 42.

Further features and details of the invention result from the dependent claims, the description and the figures. Features and details which have been described in reference to the inventive heating mat are, of course, also valid in reference with the surface heating system and/or the method according to the invention and vice versa, so that with regard to the disclosure of the individual aspects of the invention reference is or can always be made to each other.

According to the invention, the heating mat for a surface heating system, in particular for heating a room of a building, comprises a flexible base unit. The flexible base unit further comprises a first carrier element which comprises a flat extension with a first base side and a second base side. Furthermore, the base unit comprises at least one electrical heating means for emitting heat. The electrical heating means is arranged on the first base side of the first carrier element in such a way that the base unit can be laid flat for the design of the surface heating system.

Preferably, the base unit and/or the heating mat can be designed as a plate. In particular, the heating mat can also advantageously comprise a base area of less than 2 m×2 m, preferably of less than 1.5 m×1.5 m or less than 1 m×1 m, particularly preferably of less than 1.1 m×0.8 m or less than 0.7 m×0.7 m. Preferably, the heating mat can be embedded in a boundary element of a room. The surface heating system may in particular comprise a floor heating system for heating the room of the building. In addition or alternatively, it may be provided that the heating mat can be partially or completely arranged in a wall of the room to emit the heat on the wall side. It is also conceivable that the base unit comprises a square base area. This can improve the handling and reduce the kink sensitivity.

The base unit is preferably designed as a film-like, in particular moisture-impermeable, composite. By the fact that the base unit is flexible, it can be understood that the base unit can be at least partially bendable without destroying the functionality of the heating mat. The first carrier element can preferably form a base body on which the electrical heating means is arranged. The fact that the electrical heating means is arranged on the first base side of the first carrier element can be understood in the sense of the present invention as meaning that the heating means is arranged, preferably fixed, directly or indirectly on the first carrier element. Thus, it is conceivable, for example, that further components of the heating mat are arranged between the first carrier element and the electrical heating means and that the electrical heating means is only indirectly provided on the first base side. The term ‘on the first base side’ thus refers in particular to the orientation in relation to the first carrier element. Preferably, however, the electrical heating means may be arranged directly on an upper surface of the first base side of the first carrier element. In particular, the first carrier element can form a board for the electrical heating means and/or other components of the heating mat.

The fact that the base unit can be laid flat for the design of the surface heating system can be understood, in particular in the sense of the present invention, as meaning that at least the first carrier element and the electrical heating means form an installation unit, which can be pre-installed, in particular before installation on the construction site. Thus, in particular the first carrier element and the electrical heating means can be laid flat together. The flat laying can be understood in particular to mean that the base unit can be arranged on a structural element of the building and/or the room, in particular in such a way that the flat extension of the first carrier element extends parallel or substantially parallel to the structural element of the room and/or the building. Preferably, a plurality of heating mats can be laid side by side on the structural element of the building to form the surface heating system.

Preferably, the heating power of the electrical heating means can be up to 1 kW/m², preferably up to 300 W/m² or up to 500 W/m², particularly preferably between 150 and 300 W/m² or 120 to 200 W/m². In particular, in order to favour the flexibility and simple installation of the flexible base unit, the first carrier element may have a thickness of up to 2 mm, preferably of up to 1 mm, particularly preferably of about 0.5 mm. For the purpose of the present invention, the term ‘about’ can be understood as a deviation within the usual tolerances. Furthermore, it is conceivable that the base unit comprises a first and a second carrier element, each of the carrier elements preferably having a thickness of less than or equal to 1 mm, preferably of less than or equal to 0.5 mm, particularly preferably of less than or equal to 0.1 mm.

Thus, at least part of a surface heating system can be formed in a simple way by the heating mat according to the invention. For this purpose, the base unit can be laid flat as an installation unit, wherein in particular the first carrier element and the electrical heating means can be pre-installed. This simplifies the installation of the surface heating system considerably, since, for example, particularly advantageous structures of the heating means can already be specified together with the base unit and the installer can only adapt the base unit to the conditions of the room or building. In addition, the heating mat can be prefabricated in a separate production environment, so that the heating mat can be delivered as a whole to the respective construction site of the building. This results in shorter installation times on site, so that the costs for the surface heating system or the installation of the surface heating system can be reduced. In particular, the heating mat can be produced in a series production.

Within the scope of the invention, it is also conceivable that the electrical heating means is in a firmly-bonded connection to the first carrier element. In particular, the electrical heating means may be printed directly or indirectly onto the first carrier element, preferably by means of screen printing. This can further simplify series production of the heating mat. The firmly-bonded connection of the electrical heating means can be provided directly or indirectly with the first carrier element. For this purpose, the electrical heating means can be directly connected to the first carrier element or intermediate components, especially layers, can be provided which are also in a firmly-bonded connection to the first carrier element. A firmly-bonded connection between the electrical heating means and the carrier element can also achieve a high strength of the base unit so that the electrical heating means and the first carrier element cannot be separated easily on the construction site. By pressing the electrical heating means onto the first carrier element, the electrical heating means can also be precisely positioned on the first carrier element and the geometry of the electrical heating means can also be precisely specified. Screen printing offers a favourable possibility to provide conductive structures on the first carrier element. In particular, the electrical heating means can thus comprise a printable material. Additionally or alternatively, the electrical heating means can be connected to the first carrier element in a form-fit and/or force-locking manner.

In the case of a heating mat according to the invention, it is further conceivable that the electrical heating means comprises at least one resistor element which extends on the first base side of the first carrier element. Preferably, the resistor element can be designed flat, preferably plate-like. The heating power of the electrical heating means can thus be provided by the resistor element, wherein the heating power can vary depending on the electrical resistor of the resistor element. Furthermore, by means of a flat, preferably plate-like, design of the resistor element, a constant heating power can be achieved over a large area of the heating mat, while at the same time a thickness of the resistor element, i.e. in particular an extension in a perpendicular direction to the first base side of the first carrier element, can be kept low. This in turn favours the arrangement of the heating mat, for example in a floor of the room, so that the floor may not be raised or only slightly raised due to the heating mat. It is also particularly advantageous that the electrical heating means can be arranged directly on the first carrier element. This can greatly simplify the production of the heating mat.

With a heating mat according to the invention, it is also conceivable that the resistor element comprises a cured carbon paste. Preferably, the carbon paste may contain a carbon and/or a filler. The ratio of carbon to filler can preferably be between 25 and 75% by weight of the carbon paste. In particular, the carbon paste may comprise a ground carbon in powder form. In particular, the carbon paste can be printed on the first carrier element in a simple manner, so that a firmly-bonded connection, for example between the electrical heating means and the first carrier element, can be easily made. In particular, such a carbon paste is also well suited for screen printing and for adhesion to plastics. This means that the first carrier element can be made of an inexpensive material and at the same time a firmly-bonded connection with the resistor element can be favoured. The filler can be used to adjust the heating power of the carbon paste or the resistor element. In particular, the heating power of the carbon paste may vary during production of the carbon paste, e.g. depending on a supplier or production of the carbon. In order to still achieve a given heating power within a given tolerance, the filler can be added to reduce or increase the conductivity of the carbon paste.

Advantageously, in the case of a heating mat according to the invention, the base unit may be bendable, in particular wherein an achievable bending angle of the base unit is greater than or equal to 10°, preferably greater than or equal to 45°, particularly preferably greater than or equal to 90°. The achievable bending angle can in particular be understood as a permissible bending angle which does not destroy or substantially impair the functionality of the heating mat. It may be provided that the base unit comprises a bending radius when bent. In particular, an achievable bending angle must therefore be distinguished from a kinking of the base unit. Due to the high flexibility of the base unit and due to the bendability, an easy installation and a high robustness of the heating mat during transport and installation can be guaranteed. For example, it may not be necessary to carry the heating mat with special care with a plurality of people. In particular, for example, a stack of heating mats can be delivered to the construction site and a heating mat can be removed from the stack by one person.

Within the scope of the invention, it is further conceivable that the heating mat forms a heating module which can be connected together with further heating modules for the design of the surface heating system. A heating module can thus be understood as an installation unit which, together with further installation units, forms the surface heating system. Thus, the heating mat can only form a part of the surface heating system, wherein a plurality of heating mats, in particular in combination with further components, can form the surface heating system. It is conceivable, for example, that each heating module comprises a manually manageable dimensioning and can thus be conveniently handled on the construction site. Depending on the geometry of the room, the design as a heating module also offers the advantage that the surface heating system can be controlled to a size of the room by varying the number of installed heating modules.

Within the scope of the invention it is further conceivable that a sensing means is provided for detecting an event, in particular wherein the base unit comprises the sensing means. In particular, the event may comprise an activity of a person. Thus, in addition to the heating functionality of the heating mat, the functionality of the heating mat can be extended in such a way that a sensor function is simultaneously provided by which the event can be recognized. For example, it is conceivable that the detection of a person could provide a monitoring functionality of the heating mat which determines whether a person is in the room and/or moves in the room, in particular in a certain way.

The heating mat can therefore be used, for example, to monitor a room to see whether it is being entered by a person, for example if the occupant of the room is on holiday. It is also conceivable that the heating mat could be used in a health care area, for example in a retirement home, to detect whether an occupant of the room is moving and, if necessary, to initiate counter-measures if the inhabitant does not move for a long time.

Within the scope of the invention it may further be provided that the sensing means is arranged on the second base side of the first and/or second carrier element in such a way that the base unit can be laid flat for the design of a surface sensor system. Thus, in addition to the surface heating system, a surface sensor system can also be provided by the heating mat and can be formed together when the base unit is laid. In this way, for example, the room can be monitored over a larger area, especially over the entire surface, to detect the event. In particular, the heating mat can also form a sensor module which, together with other sensor modules, forms the surface sensor system. The arrangement of the sensing means on the second base side can also be provided directly or indirectly on the first and/or second carrier element. In particular, the sensing means can thus be laid flat together with the electrical heating means and the first and/or second carrier element. The sensing means can thus have the same advantages as those already explained with regard to the electrical heating means or the base unit with regard to simple installation, while at the same time increased functionality of the heating mat can be guaranteed by the sensing means.

Preferably, in the case of a heating mat according to the invention, it may be provided that the base unit comprises a second carrier element on which the sensing means is arranged, in particular wherein the heating means and/or the sensing means is arranged between the first and the second carrier element. Thus, the heating means and the sensing means can be arranged independently and/or separately from each other. By the arrangement of the heating means and/or the sensing means between the first and the second carrier element, the heating means and/or the sensing means is at least partially protected by the first and second carrier element. Thus, on the one hand, the carrier elements can each provide a base to which the heating means and the sensing means can be applied, preferably printed. On the other hand, protection against environmental influences can also be guaranteed. The sensing means is preferably arranged on a second base side of the second carrier element, wherein the second base side of the second carrier element and the first base side of the first carrier element facing each other. This allows the heating means and the sensing means to be arranged between the first and second carrier elements.

Within the scope of the invention, it may further be provided that an intermediate element is arranged between the first and second carrier element, by means of which the first carrier element is at least partially, preferably completely, spaced apart from the second carrier element. By means of the intermediate element, the heating means can be electrically insulated and/or spatially separated from the sensing means. Furthermore, disturbance variables between the heating means and the sensing means can be reduced or avoided. In particular, the accuracy of the sensing of the event by the sensing means can thus be improved if the heating means is spaced apart from the sensing means. Preferably the intermediate element is designed as a sound insulation layer. Thus, the intermediate element can take over a plurality of functions. Firstly, impact sound can be damped by the intermediate element. On the other hand, the distance between the heating means and the sensing means can be realized by the intermediate element. Preferably, an adhesive layer can be arranged between the intermediate element and the first carrier element and/or between the intermediate element and the second carrier element. It is also conceivable that the intermediate element is designed as an insulating layer for thermal insulation.

It is further conceivable that in the case of a heating mat according to the invention, the sensing means is in a firmly-bonded connection to the first and/or second carrier element, in particular wherein the sensing means is printed onto the first and/or second carrier element, preferably by means of screen printing. Thus, even if the sensing means is present, series production of the heating mat with increased functionality may be favoured. At the same time, a firmly-bonded connection between the first and/or second carrier element and the sensing means offers a simple possibility to ensure a safe connection. As an alternative to an imprint, the sensing means can also be welded, glued or the like to the first and/or second carrier element in order to connect the sensing means with the first and/or second carrier element in a firmly-bonded connection. Additionally or alternatively to a firmly-bonded connection, it is further conceivable that the sensing means is fixed in a form-fit and/or force-locking manner to the first and/or second carrier element, wherein, for example, a wire of the sensing means may be interwoven with the first and/or second carrier element or the sensing means may be riveted to the first and/or second carrier element.

Advantageously, in the case of a heating mat according to the invention, it can be provided that the sensing means comprises at least two, preferably four, sensor elements, each having a sensing region. In particular, the sensing regions may differ at least in some regions. It is also conceivable that the sensing means comprises further sensor elements with further sensing regions. The sensing regions enable the increase of the accuracy of the detection of the event and/or the range of possible recognizable events. Thus, it is conceivable that the event recognizes a change in the sensing regions over time, so that a movement of a person can be inferred. It is also conceivable that a person moves in a certain direction over the heating mat, which can be detected by the sensing regions when the person leaves one sensing region and enters another sensing region. In addition or alternatively, the sensing regions can be used to mutually validate a signal of the detection of the event to reduce measurement errors. Furthermore, it is conceivable, for example, that the event is detected in each of the sensing regions and thus the actual presence of the event can be inferred. In addition, the at least two sensor elements can ensure that the heating mat can be cut to size, for example to adapt to the geometry of the room, without completely losing the functionality of the sensing means. Thus, it can be provided that one of the sensor elements will still function even if another sensor element is cut off from the heating mat, for example to consider a corner of a room or a boundary of the room. Four sensor elements have proven to be particularly advantageous as they can be easily connected to a central evaluation unit. Furthermore, a division into four sensor elements comprises a positive effect on the manageability of the heating mat in terms of size as well as the ability to be cut to size. The sensor elements can preferably comprise a base area of greater than or equal to 200 m×200 mm, preferably greater than or equal to 300×300 mm.

Within the scope of the invention, the sensing means may further comprise at least one electrode for capacitive detection of the event. Thus, at least part of a capacitance may be formed by the sensing means, in particular part of a plate capacitor. The electrode can thereby act together with a part of the body of a person, the part of the body of the person being able to form the counter-electrode for producing the capacitance. A change in capacitance may thus indicate movement of the person. By a capacitive detection of the event, it is possible to carry out the detection in a simple way, for example in the case of a floor heating system through a floor covering. Thus, the detection can be based on an electric field, which in particular can act through at least one structural element of the building. In particular, it is also conceivable that, for the intended use of the heating mat, the electrical heating means for the formation of the surface heating system can be arranged on the floor side and the sensing means can be arranged above the electrical heating means. Preferably, the electrical heating means can emit the heat through the sensing means or past the sensing means so that both functionalities of the heating mat can be ensured in an advantageous manner even in a layered composite of the heating mat. In addition, the capacitive detection can provide a low-energy option for monitoring at least part of the room. In particular, at least one electrode can be assigned to each sensor element.

In the case of a heating mat according to the invention, it may also be provided that the sensing means comprises at least two electrodes by means of which an electric field can be jointly generated, in particular for capacitive detection of the event. Thus, it is not necessary, for example, for the body part of a person to be detected to form part of the capacitance. Rather, an electric field can already be generated, in particular by the sensor elements, wherein the presence of a person in the electric field can cause a change in the electric field. This can further increase the accuracy of the sensing means for detection. Furthermore, the sensing means can thereby be less sensitive to interference effects of other structural elements of the building, such as a functional floor covering and/or a visible floor covering of the room and/or a floor. In particular, at least two electrodes can be assigned to each sensor element.

Furthermore, it is conceivable that the sensing means comprises an electrode which is designed as a shield electrode for limiting an electric field. In particular, one of the two electrodes, by which the electric field can be generated together, can be designed as a shield electrode. By means of the shield electrode, the electric field can be shielded from the outside and spread at least substantially within the limitation of the shield electrode and/or be protected at least substantially by the limitation of the shield electrode against external influences. The accuracy of the measurement, in particular capacitive measurement, by the sensing means can thus be improved. Preferably, the shield electrode may be formed on one edge of the sensing means and/or around a plurality of electrodes, in particular around each of the sensor elements, at least substantially, in particular completely. This allows an advantageous shielding of the sensing means and/or each of the sensing regions to be realized.

In the case of a heating mat according to the invention, it may further be provided that the first and/or second carrier element comprises a plastic, preferably a thermoplastic, particularly preferably a polyester, or consists of a plastic, preferably a thermoplastic, particularly preferably a polyester. As already described above, a plastic offers a simple and inexpensive possibility of providing a firmly-bonded connection to the resistor element of the electrical heating means. In particular, the first and/or second carrier element can comprise a polyethylene terephthalate (PET) or consist of a polyethylene terephthalate (PET). Thus, the first and/or second carrier element can be produced in a simple manner, for example in the form of a film. This in turn can have a positive effect on simple series production, as the first and/or second carrier element can be produced as a strip material, for example, and can be cut to size depending on the dimensions of the heating mat. In addition, a plastic offers good resistance to environmental conditions, in particular to corrosion or similar. Thus, the formation of the first and/or second carrier element by means of plastic can simultaneously provide a chemical resistance of the first and/or second carrier element and thus at least partially of the base unit to building materials, for example a floor of the room. In particular, the first and second carrier element can be of the same material.

The invention may further provide that a temperature sensor is provided for calibrating the electrical heating means. Preferably, the temperature sensor may be arranged on or next to the base unit. By means of the temperature sensor, for example, the electrical heating means can be calibrated when the heating mat is put into operation, wherein the heating power can be adapted to the environmental conditions. In particular, a reference temperature can thus be set which the electrical heating means should reach in order to achieve a certain room temperature assigned to the reference temperature. Furthermore, the temperature sensor can also be used to adjust the electrical heating means when the heating mat is in operation. For example, depending on the current temperature, it may be intended that the electrical heating means is supplied with more or less power. The temperature sensor can preferably comprise a thermocouple or an NTC resistor. Thus, the temperature sensor can be designed small in order to keep the installation space required by the heating mat small. It is also conceivable that the temperature sensor is arranged in a flush-mounted device in which a control unit can also be arranged, for example. Thus, a central temperature sensor can be provided for the surface heating system, wherein the temperature sensor can be provided for the heating mat, and preferably for further heating mats. Preferably, the temperature sensor can be part of a decentralized evaluation unit for the heating mat.

In the case of a heating mat according to the invention, it is further conceivable that, in particular on the first and/or second base side of the first and/or second carrier element, a sound insulation layer is arranged on the base unit. The sound insulation layer can serve in particular to damp impact sound. If a sensing means is present, sound bridges of the sensor elements can be reduced or avoided by the sound insulation layer. Impact sound can be understood to be sound which can be caused by the movement of a person on a floor. This sound in particular can be damped by the sound insulation layer. The sound insulation layer can comprise a fibreboard, a foam and/or a fleece. Thus, by means of the heating mat, a functionality of the floor can be guaranteed at the same time, by which at least a part of a floor is decoupled with regard to sound. This can have a positive effect on a person's perception of impact sound on the floor. Preferably, the sound insulation layer can be arranged on the base unit, especially directly on the base unit.

Within the scope of the invention it may further be provided that, in particular on the first base side of the first carrier element and/or on the second carrier element, a sealing layer is arranged on the base unit. Preferably, the sealing layer may comprise at least one fibre layer. Preferably, the sealing layer can extend over the entire or substantially the entire base unit. The term ‘substantially’, it can be understood that only some edge regions are free of the sealing layer in order to guarantee a connection, for example with further heating mats. The sealing layer is preferably used to prevent moisture from the room from reaching the base unit, or at least to reduce the amount of moisture reaching the base unit, in order to protect the electrical components of the base unit from moisture and/or possible corrosion. This can be particularly advantageous if, for example, the heating mat is to be installed in a damp room, such as a bathroom. The sealing layer and/or the sound insulation layer can also be prefabricated on the base unit and delivered to a construction site together with the base unit. This means that further installation work can be avoided at the construction site and/or a series production, in particular off-site the construction site, can be favoured.

Preferably, the sealing layer of a heating mat according to the invention can comprise a non-woven fabric. The non-woven fabric can be inexpensive to produce and at the same time provide high sealing functionality with good compatibility with other surrounding materials. In particular, the non-woven fabric can also simultaneously damp impact sound, so that further advantages can arise when the heating mat is used in a floor heating system. The nonwoven can also be easily processed both on and off site.

Within the scope of the invention, it is further conceivable that the sealing layer and/or the sound insulation layer is fixed to the base unit with an adhesive layer. Preferably, both the sealing layer and the sound insulation layer can be fixed to the base unit with an adhesive layer each. The adhesive layer may in particular comprise a double-sided adhesive tape. The adhesive layer can be used to easily arrange the sealing layer and/or the sound insulation layer to the base unit, while at the same time facilitating series production. In particular, in combination with a double-sided adhesive tape, this simplifies the installation of the sealing layer and/or the sound insulation layer on the base unit. At the same time, the adhesive layer can, for example in an edge region, enable two adjacent heating mats to be connected to each other in a simple manner when designing the surface heating system, without the need for any further aids.

In the case of a heating mat according to the invention, it is further conceivable that the electrical heating means is at least partially covered by a first electrically insulating protective layer and/or the sensing means is at least partially covered by a second electrically insulating protective layer. In particular, the first and/or second electrically insulating protective layer may be part of the base unit. Thus, in particular a simple production of the base unit in series is possible if, for example, the electrical heating means and/or the sensing means is printed on the first carrier element and then covered with an electrically insulating protective layer. The first and/or second electrically insulating protective layer may preferably comprise a polymer, in particular a photoresist. In particular, the first and/or second electrically insulating protective layer may be printed on the first carrier element and/or the heating means and/or the sensing means in order to provide a protective effect. By using a photoresist for the first and/or second electrically insulating protective layer, the production of the heating mat may be simplified, for example, by applying the photoresist in liquid form and curing it by exposure, in particular ultraviolet exposure. In particular, the photoresist can thus be a negative resist.

Within the scope of the invention it is further conceivable that the base unit comprises at least one electrical connection, in particular for connection to an energy source and/or to a control unit. Preferably, the electrical connection may have a connection means for reversibly connecting the electrical heating means and/or the sensing means to the energy source and/or the control unit. By means of the electrical connection, an interface can be provided in a simple manner by which the heating mat can be connected to an energy source and/or a control unit. The connection to the energy source and/or to the control unit can be provided indirectly, wherein, for example, further heating mats can be connected in between. For improved electrical contact, the connection means can preferably be connected to the base unit by means of an electrically conductive adhesive. The reversible connection of the electrical heating means to the energy source and/or the control unit can further simplify the installation of the heating mat for designing the surface heating system. For example, the electrical connection may comprise a push-button and/or an eyelet to ensure the reversible connection of the electrical heating means to the energy source and/or the control unit. In particular, the reversible connection also makes it possible, for example in the event of incorrect installation, to ensure easy release, in particular non-destructive release, which can further simplify the installation of the surface heating system as a whole. Furthermore, it is conceivable that the connection means comprises an electrical contact, in particular an exposed one, on the base unit.

Furthermore, in the case of a heating mat according to the invention, it may be provided that the electrical connection comprises a connection interface for connecting the electrical heating means and/or the sensing means to a connection unit for connecting the connection interface to a counter-connection interface, in particular wherein the connection interface comprises at least one alignment means by which a mal-positioning of the connection unit can be prevented. The alignment means may comprise openings and/or projections which correspond to a positioning aid of the connection unit. In particular, the connection unit may be provided as an additional assembly, which is added only when the surface heating system is installed. The connection unit can be used to create a simple, construction site-specific connection option. A plurality of, preferably three, openings can be provided. With an appropriate arrangement of the alignment means, only a correct or a correct and an obviously or conspicuously wrong position of the connection unit at the connection interface can be possible. The connection interface can advantageously be designed to be connected to the connection unit in a force-locking, firmly-bonded and/or form-fit connection. In particular, the connection interface can be designed for a magnetic connection with the connection unit. For this purpose, the connection interface can comprise a magnet or a magnetizable material. This can create a particularly simple and, in particular, construction site compatible connection option.

Furthermore, it may be provided within the scope of the invention that the connection interface comprises a recess in the base unit for receiving the connection unit, in particular wherein the recess is at least partially limited by the first and/or second carrier element. The recess may in particular comprise a cut-out from the intermediate element and the first and/or second carrier element. In this way, a simple receptacle for the connection unit can be created. In recesses to which no connection unit is to be attached, a dummy piece may be provided by which the connection interface is protected. If the recess is limited by the second, preferably the first, carrier element, a connection means in the form of an electrical contact may be provided on the first and/or second carrier element so that the connection unit can easily be brought into electrical contact with the heating mat. It is also conceivable that the first and/or second carrier element is magnetically clamped in the connection unit. This can improve electrical contact and fixation of the connection unit to the heating mat.

The invention may further provide that the electrical connection comprises a heating connection, which is connected to the electrical heating means, and/or a data connection, which is connected to the sensing means. Preferably, the electrical connection may comprise a heating connection and a data connection. However, it is also conceivable that the heating connection and the data connection are spatially separated, in particular arranged on different sides of the heating mat. Through the heating connection it may be possible to supply the electrical heating means with energy. It is also conceivable that the electrical heating means is also controlled by the heating connection. The control can be provided, for example, by switching a current on or off at the electrical heating means. The data connection can also be used to enable the sensing means to communicate with the control unit. In particular, the data connection can also be used to ensure that the sensing means is supplied with energy. Thus, a voltage can be applied to the heating connection and/or the data connection. In particular, the heating connection and the data connection may be provided together at the electrical connection, so that the connection of the heating mat to further heating mats and/or to a control unit and/or an energy source can be carried out intuitively in a simple manner, while the installer can concentrate on the electrical connection. In particular, this can simplify installation to the extent that the error rate of connecting the heating mat can be reduced.

In the case of a heating mat according to the invention, it is further conceivable that the electrical connection is arranged in an edge region of the base unit, in particular wherein the electrical heating means is connected to the electrical connection by at least one conductor track and/or wherein the electrical heating means is arranged in a central region of the first carrier element. The arrangement of the electrical connection in the edge region of the base unit can thus enable simple connection of the base unit and/or the heating mat without impairing the functionality of the heating means and/or the sensing means. A connection between the heating means and the electrical connection can be realized in a simple manner by means of the conductor track. By arranging the electrical heating means in the central region of the first carrier element, it can also be designed for a flat functionality of the heating power. An overlapping of a plurality of resistor elements when arranging a plurality of heating mats next to each other is not necessary if the electrical connection and the electrical heating means are spatially separated. Preferably at least two conductor tracks can be provided, in particular by which different electrical potentials can be applied to the resistor element.

Within the scope of the invention, it may further be provided that the electrical heating means comprises a heating conductor element by means of which the resistor element is connected to the conductor track. In particular, the heating conductor element can be arranged directly on the first carrier element. The heating conductor element can preferably comprise a different material than the resistor element. The heating conductor element can preferably be made of a noble metal, preferably silver. This means that the heating conductor element can have a lower resistance than the resistor element, so that the losses due to electrical resistance can be kept low by contacting or electrically coupling the electrical heating means with the conductor track, and thus the resistor element comprises the decisive part of the heat development and energy absorption. In order to achieve a particularly simple design, for example, the heating conductor element can be arranged directly on the first carrier element and the resistor element directly on the heating conductor element. Thus, a firmly-bonded connection of the heating conductor element with the first carrier element and/or the resistor element can be provided. This means that the heating mat can have only a small overall thickness and at the same time, the design can be kept simple.

The advantage of a heating mat according to the invention is that the conductor path can be in a firmly-bonded connection to the first carrier element. In particular, the conductor path can be printed on the first carrier element. In particular, the conductor path can be screen printed on the first carrier element. This ensures a secure connection of the conductor track to the first carrier element, while at the same time simplifying series production of the heating mat.

Within the scope of the invention it is further conceivable that the conductor path, in particular in the edge region of the base unit, is arranged circumferentially on the first carrier element. This allows the heating mat to be easily adapted to room geometries by cutting it to size without, for example, completely destroying the functionality of the heating means. Thus, for example, individual resistor elements can be cut off while other resistor elements are still functioning, as these can preferably be connected to the conductor track with a plurality of heating elements or can be connected to the circumferential conductor track at a plurality of points.

It may be advantageous in the case of a heating mat according to the invention that a plurality of sensor elements of the sensing means are arranged in a regular distribution pattern, in particular on the second base side of the first carrier element and/or on the second carrier element. This can result in an advantageous monitoring functionality of the sensing means, wherein, on the one hand, an assignment of the individual sensor elements in the room can be simplified if the distribution pattern is formed regularly, and on the other hand, cutting the heating mat to size can also be favoured. Furthermore, a plurality of sensor elements can form overlapping or adjacent sensing regions, which can be used for validation when detecting an event. Thus, by laying flat a single heating mat, a plurality of sensor elements can be laid flat at the same time, so that the installation of the surface heating system can be simplified and in particular accelerated. Additionally or alternatively, it may be provided that a plurality of resistor elements of the electrical heating means are arranged in a regular distribution pattern, in particular on the first base side of the first carrier element and/or on the second carrier element. The resistor elements can thereby favour a cutting possibility of the heating mat and/or enable a homogeneous heat distribution over a surface of the heating mat.

Within the scope of the invention it is further conceivable that the sensing means is connected to at least one decentralized evaluation unit, in particular for processing sensor data of the sensing means. Preferably, the decentralized evaluation unit is electrically and/or mechanically connected to a data line of the base unit by means of electrically conductive adhesive. The decentralized evaluation unit can thus be part of the heating mat and preferably be pre-installed on the base unit. With the decentralized evaluation unit it is possible to tap the sensor data close to the sensor elements or the sensor element so that no or only slight losses occur during the transmission of the sensor data. This can have a positive effect on the accuracy and/or reliability of the sensing means, in particular in the case of capacitive sensing. The decentralized evaluation unit can preferably comprise an analogue-digital converter, in particular on a circuit board. Thus, for example, it can be provided that the decentralized evaluation unit converts analogue sensor signals into digital signals and transfers them to a central control unit. Thus, the required installation space of the evaluation unit can be small, but at the same time an increased accuracy and/or reliability can be provided. In particular, each of the sensor elements of the sensing means can be connected to a respective decentralized evaluation unit. This means that a respective sensor signal can be tapped and at least partially processed in the direct vicinity of the sensor elements, so that losses during the transfer can be kept low. Additionally or alternatively, the decentralized evaluation unit can be connected to each of the sensor elements of the heating mat. Thus, one decentralized evaluation unit per heating mat can be sufficient to process the sensor data of all sensor elements of the heating mat. This comprises the advantage that the lines for the sensor data, in particular analogue sensor data, can be kept short up to the decentralized evaluation unit and at the same time, only one decentralized evaluation unit is used per heating mat. The decentralized evaluation unit can preferably comprise a printed circuit board, a processor, in particular a microprocessor, and/or further electronic structural elements. Preferably, the decentralized evaluation unit can be covered with a casting compound, which in particular comprises a synthetic resin or consists of a synthetic resin. This can protect the electrical components of the decentralized evaluation unit.

With a heating mat according to the invention, it is also conceivable that the sensing means and/or the decentralized evaluation unit can be connected to a central control apparatus. In particular, each decentralized evaluation unit can be connected to the central control apparatus. In this way, the data can be transferred from the decentralized evaluation unit to the central control apparatus in a simple manner, wherein, as described above, the decentralized evaluation unit can be designed in a simple manner, while, for example, complex computing operations can be executed by the central control apparatus. This means that the computing capacity can be concentrated in the central control apparatus, for example. Preferably, the central control apparatus is part of a control unit through which, for example, the electrical heating means can also be controlled.

Advantageously, in the case of a heating mat according to the invention, the central evaluation unit can be arranged on the first base side or the second base side of the first carrier element on the base unit. Preferably, the decentralized evaluation unit can be at least partially embedded in the sound insulation layer. Thus, the sound insulation layer can simultaneously comprise a protective effect for the evaluation unit, preferably so that the sound insulation layer can yield slightly when the heating mat is stressed in the area of the decentralized evaluation unit, so that the stress cannot completely affect the decentralized evaluation unit. Furthermore, embedding the decentralized evaluation unit in the sound insulation layer can ensure that the installation space for the design of the heating mat is effectively used, so that the thickness of the heating mat can be limited.

Within the scope of the invention it is further conceivable that the base unit comprises at least one data line which is in communication connection with the sensing means and/or with the decentralized evaluation unit. The data line may in particular be provided separately from the conductor track and enable the sensing means to be connected to the data connection. In this way, a connection option can be created in a simple manner through which data of the sensing means can be transported to further components of the surface heating system. In particular, the data line can be arranged on the first and/or second carrier element. This can create a simple connection option if the connection interface comprises a recess. It is thus conceivable that the data line is arranged on the first base side of the first carrier element so that electrical contact can be made at the electrical connection for the heating means and the sensing means via the first carrier element.

Furthermore, with a heating mat according to the invention, it is conceivable that the decentralized evaluation unit extends at least partially into a receiving opening of the intermediate element. Thus, the decentralized evaluation unit can be embedded e.g. in the intermediate element and be at least partially protected from external influences by the intermediate element. Furthermore, a thickness of the heating mat can be kept small if the decentralized evaluation unit does not or only partially protrudes from the base unit. For example, the receiving opening can be cut into the intermediate element. In addition or alternatively, it may be provided that at least one sensor element of the sensing means is connected to the data line by the decentralized evaluation unit. Thus, for example, a transition of the sensor data from the first to the second carrier element and vice versa can also be realized by the decentralized evaluation unit, in particular if the decentralized evaluation unit simultaneously extends into the intermediate element.

Furthermore, in the case of a heating mat according to the invention, it is conceivable that the decentralized evaluation unit and/or the heating means is electrically coupled to the electrical connection by a connection section, in particular wherein a data line and/or at least part of a conductor track is formed by the connection section. The connection section can preferably be arranged on the first base side of the first carrier element, in particular printed on the first base side of the first carrier element. In this way, a direct connection of the decentralized evaluation unit with the electrical connection can be created in a simple manner. Sensor data can be transferred to a control unit via the connection section. Furthermore, the heating means can be supplied with current via the connection section or a potential can be applied to a resistor element of the heating means.

Preferably, in the case of a heating mat according to the invention, it may be provided that a plurality of electrical connections, in particular for connection to an energy source and/or to a control unit, are arranged in an edge region of the base unit, in particular wherein a plurality of connection sections extend from the decentralized evaluation unit, preferably in a cross-like manner, to the electrical connections. The decentralized evaluation unit can preferably be arranged centrally on the base unit. The electrical connections are preferably arranged in an edge region of the base unit. Thus, a short distance can be achieved by the cross-like design of the connection sections. In particular, the connection sections can be connected via the decentralized evaluation unit or can be at least partially directly connected to each other. In particular, the heating conductor element can comprise connection sections that are connected to each other circumferentially. This can improve the cutting possibility of the heating mat if a cut through one of the connection sections does not directly lead to a cut in the current supply for the resistor elements. The data line can preferably comprise separate connection sections.

Within the scope of the invention, it may be provided that a passage element is provided which extends at least partially through the first carrier element for connecting the sensing means with the decentralized evaluation unit. The passage element may preferably comprise a rivet which is inserted into the first carrier element during the production of the base unit. However, other possibilities of connecting the two base sides of the first carrier element are also conceivable. Preferably, the passage element can be electrically conductive. This can enable the sensing means, which is preferably arranged on the second base side of the first carrier element, to be connected to an electrical component on the opposite, in particular the first base side, of the first carrier element. Thus, on the side of the first carrier element opposite to the sensing means, for example, a decentralized evaluation unit can be arranged, which can be electrically coupled to the sensing means by the passage element. In this way, contact can be made via the first carrier element without, for example, laying a line along the outside of the base unit and winding it at least partially around the base unit in order to reach the other side. At the same time, the distance travelled through the passage element can be small, so that the electrical resistance and thus possible signal losses can also be low. The passage element also facilitates simple production, in particular if it is designed as a rivet, for example.

The invention may also provide that the data line comprises a ring section, which runs at least partially, preferably completely, circumferentially around a central region of the base unit. Preferably, the data line may comprise a supply section, which is arranged at least partially in the central region. The ring section can preferably be understood as a section of the data line which extends along the edge region of the base unit. The ring section can be round or adapted to an angular shape of the heating mat. The ring section makes it possible to obtain a connection between the sensing means and a data connection, even if the heating mat is cut to size, for example, to adapt to a geometry of a room. In particular, the supply sections connect the ring section with the sensing means and/or the decentralized evaluation units, which are preferably located in the central region of the base unit.

Advantageously, the data line can be connected to a data connection, which is accessible from outside the base unit. Preferably, the data line can be connected to the central control apparatus through the data connection. Thus, the data connection can ensure that the sensing means and/or the decentralized evaluation unit can be connected to the central control apparatus. This can be done indirectly, for example, by connecting a plurality of heating mats to each other via different data connections and finally connecting at least one of the heating mats to the central control apparatus.

Preferably, with a heating mat according to the invention, the data line can be connected via the ring section to a plurality of data connections, which are arranged in an edge region of the base unit. In particular, the data connections can be part of electrical connections in the edge region of the base unit. The fact that the data line is connected via the ring section to a plurality of data connections further facilitates the possibility of cutting the heating mat to size. In particular, regions in which a connection is provided can thus also be cut off without significantly impairing the functionality of the sensing means. Thus, for example, it may only be necessary to leave one data connection if the heating mat is adapted to a geometry of the room by cutting.

In the case of a heating mat according to the invention, it is also conceivable that the electrical heating means and/or the conductor track and/or the data line and/or the sensing means comprises a noble metal, in particular silver. It is thus conceivable, for example, that a heating conductor element of the electrical heating means and/or a sensor element of the sensing means comprises the noble metal, in particular silver. A low resistance of the respective component can be ensured by the noble metal, so that the electrical power is not or at least reduced in the form of heat, unintentionally emitted. In particular, in the region of the sensing means, a measurement result of the detection of the event can also be improved in its accuracy and/or reliability. Furthermore, for example a silver can be processed in a simple way in a printing process, so that a simple production of the heating mat can be improved, for example by printing individual components.

It is further conceivable that a heating mat according to the invention comprises at least one nominal cutting line along which it is possible to cut the heating mat for adaptation to a geometry of the room without completely destroying the function of the heating means and/or the sensing means, in particular wherein a part of the heating means and/or sensing means can be separated along the nominal cutting line during cutting. The nominal cutting line can be understood as a region along which an advantageous cutting possibility is created so that the function of the heating means and/or the sensing means is not completely destroyed. Preferably, the nominal cutting line can be pre-drawn and/or pre-perforated so that an installer can quickly identify the nominal cutting line. A plurality of nominal cutting lines can also be provided. This can further improve the flexibility of the installation option. Furthermore, it is conceivable that the nominal cutting lines may result, for example, from the arrangement of the sensor elements of the sensing means and/or the resistor elements of the heating means, in particular if the sensor elements and/or the resistor elements are arranged in a regular pattern.

According to a further aspect of the invention, a surface heating system for heating a room of a building is claimed. At least one heating mat according to the invention is laid flat on a structural element of the building.

This means that a surface heating system according to the invention enables the same advantages as have already been described in detail with regard to a heating mat according to the invention. The structural element of the building can preferably be understood to be a carcass component, in particular a carcass floor. It is conceivable, for example, that the heating mat according to the invention is laid on the structural element and then covered with a functional and/or visible covering of the floor to be produced. In particular, the surface heating system may comprise a plurality of inventive heating mats which are connected to each other. The surface heating system can also be designed as a floor heating system. In this case, the surface heating system can be laid flat in a simple manner and can also take up a small amount of space within the building having a small thickness, so that other components of the building are not or only slightly affected by the heating mat or the surface heating system. Preferably, the surface heating system can also comprise a central control apparatus by which the heating mat and/or the heating mats can be controlled. The central control apparatus can be arranged in a flush-mounted box, for example.

According to another aspect of the invention, a method for producing a heating mat, in particular a heating mat according to the invention, for a surface heating system, in particular for heating a building, is claimed. Preferably, the surface heating system can be a surface heating system according to the invention. The method further comprises the following steps:

-   -   Providing a first carrier element, which comprises a flat         extension with a first base side and a second base side,     -   Constructing a flexible base unit, wherein an application of an         electrical heating means is carried out on the first base side,         in particular on the first base side, of the first carrier         element, so that at least the base unit can be laid flat for the         design of the surface heating system.

Preferably, the surface heating system can be a surface heating system according to the invention. In particular, the method according to the invention thus brings the same advantages as those already described in detail with regard to a heating mat according to the invention. The provision of the first carrier element may preferably comprise the production of a film, in particular a PET film. When applying the electrical heating means to the first base side, the electrical heating means can preferably be arranged directly on the first base side of the first carrier element or be arranged indirectly on the first base side of the first carrier element. Preferably, the application of the electrical heating means on the first base side of the first carrier element can create a firmly-bonded connection between the electrical heating means and the first carrier element. However, it is also conceivable, that the electrical heating means is attached in some other way to the first carrier element or to a further component of the base unit.

Thus, a heating mat can be produced in a simple way, which can be installed in a simple way to design a surface heating system in a room of a building. For example, the provision of the first carrier element and the construction of the flexible base unit can be carried out at a production site separate from the construction site of the building, while the installation is finally carried out in the room itself, wherein only the heating mat or a plurality of heating mats are laid out.

It is further conceivable within the scope of the invention that the application of the electrical heating means on the first base side of the first carrier element comprises the following steps:

-   -   Applying a conductor material of the electrical heating means in         at least partially liquid form on the first base side of the         first carrier element,     -   Curing the conductor material.

The application of the conductor material may preferably comprise printing of the electrical heating means. In this way, the conductor material can be applied, preferably in atomized form, to the regions to be printed and can create a firmly-bonded connection, in particular with the first carrier element. The conductor material can be cured preferably by UV radiation or by temperature application. This can accelerate the curing of the conductor material in liquid form.

The conductor material can preferably comprise a carbon and/or a filler. The conductor material can be premixed or the carbon and filler can only be mixed when the conductor material is applied. This can be advantageous for series production of the heating mat, in particular since the conductor material can be applied in liquid form in a reproducible manner.

Furthermore, in the case of a method according to the invention, it is conceivable that the method comprises the following steps:

-   -   Providing a second carrier element, which comprises a flat         extension with a first base side and a second base side,     -   Fixing the first and second carrier elements together.

Preferably, the first and second carrier elements can be fixed together in such a way that the first base side of the first carrier element and the second base side of the second carrier element face each other. The first and second carrier elements can be fixed together in a force-locking, firmly-bonded and/or form-fit connection. In this way, the base unit can be created in a simple way. The second carrier element can also provide further protection for the heating means.

Advantageously, in a method according to the invention, it can be provided that the fixing of the first and second carrier element to each other comprises the arrangement of an intermediate element between the first and second carrier element, in particular wherein an adhesive layer is arranged between the intermediate element and the first carrier element and/or between the intermediate element and the second carrier element. By means of the intermediate element a distance between the carrier elements is achieved in a simple manner. If, for example, the heating means is arranged on the first carrier element and the sensing means is arranged on the second carrier element, mutual interference between the sensing means and the heating means can thereby be reduced. The adhesive layer can be laminated, in particular in the form of a double-sided adhesive tape, to the intermediate element and/or the first and/or second carrier element. This results in an easy fixing option of the intermediate element. The intermediate element can advantageously be designed as a sound insulation layer and/or as an adhesive layer itself.

The invention may also provide for the following step to be carried out before the application of the electrical heating means:

-   -   Pre-tempering of the first and/or second carrier element.

By pre-tempering the first and/or second carrier element, shrinkage during printing of the conductor material can be absorbed. When the electrical heating means is applied, in particular if this is realized by a printing method, the first and/or second carrier element can be heated locally so that thermal stresses occur and at least partially deform the first and/or second carrier element. On cooling, this deformation may finally be reduced, so that damage to the heating means may occur. This can be counteracted by pre-heating the first and/or second carrier element.

In the case of a method based on the invention, the construction of the base unit may advantageously comprise the following step:

Applying a sensing means for detecting an event on the second base side, in particular on the second base side, of the first carrier element and/or on the second carrier element, so that at least the base unit can be laid flat for the design of a surface sensor system.

Thus, the functionality of the heating mat can be supplemented by the functionality of the sensing means. In order to keep the need for electrical insulation to a minimum, the sensing means can be preferably arranged on the base side of the first carrier element opposite the electrical heating means. Additionally or alternatively, the sensing means can be arranged on the second carrier element, in particular on a first and/or second base side of the second carrier element. The event may preferably comprise an activity of a person, wherein the activity may comprise for example a stay of the person in the room. In this case, the surface sensor system may be a device or a system suitable for sensing the event or a plurality of events distributed over a surface of the room.

The invention may also provide that the construction of the base unit comprises at least one of the following steps:

-   -   Applying a first protective layer to the electrical heating         means, in particular by varnishing, and/or     -   Applying a second protective layer to the sensing means, in         particular by varnishing.

Preferably, the electrical heating means and the sensing means can be covered with the first and second protective layer respectively. The first and second protective layer, respectively, may provide electrical insulation so that both the functionality of the electrical heating means and/or the sensing means may be protected against external influences and the environment may be protected against current from the electrical heating means and/or the sensing means. Varnishing can provide an easy way to produce the heating mat in series production. In particular, this can reduce the costs of production.

It is further conceivable that in a method according to the invention, the application of the sensing means comprises the following steps:

-   -   Applying a sensor material of the sensing means in at least         partially liquid form on the second base side of the first         and/or second carrier element,     -   Curing the sensor material.

As already described for the application of the electrical heating means, the sensor material can also be applied to the first and/or second carrier element preferably by a printing process. In this way, a firmly-bonded connection can be produced in a simple and cost-effective manner. At the same time, the application of the sensor material in at least partially liquid form offers the possibility of precisely producing the sensing means in a reproducible manner.

Advantageously, it may be provided that in the case of a method according to the invention, the method further comprises at least one of the following steps:

-   -   Constructing at least one connection interface by pressing on a         connection means and/or a counter-connection interface by         pressing on a counter-connection means, in particular wherein         the connection means and the counter-connection means are         pressed on simultaneously and/or     -   Constructing a connection interface by cutting a recess, into         which a connection unit can be inserted, into the base unit, in         particular so that the first and/or second carrier element at         least partially limit the recess.

In particular, the connection interface can be a connection interface for reversibly connecting the connection means with a counter-connection means. The connection means can preferably be a push-button, while the counter-connection means can preferably be an eyelet. This makes it easy to create a reversible connection option for the heating mat. In addition or alternatively, the connection interface can be created, for example, by providing a punching and/or drilling operation through which a contact can be inserted into the base unit and/or exposed on the base unit. In particular, the connection interface can also be formed in such a way that, when the first and/or second protective layer is applied to the electrical heating means or the sensing means, a region of the electrical heating means or the sensing means is covered so that the first or second protective layer does not arise in this region. This means that the electrical heating means or the sensing means can be exposed in this region and thus allow contact. The press tool can preferably be designed to press on both the connection means and the counter-connection means. For this purpose, the press tool can be designed to receive the base unit and can comprise different punches at the respective positions in order to simultaneously press on the counter-connection means and the connection means. Furthermore, contacts for the heating means, the sensing means and/or the decentralized evaluation units can also be pressed on simultaneously with the connection means and the counter-connection means. Preferably, an electrically conductive adhesive may be applied to connect the connection means and/or the counter-connection means to the base unit. To accelerate the bonding, the electrically conductive adhesive can be cured, e.g. thermally and/or by means of UV radiation. The connection interface can also be used to create a simple receptacle for the connection unit. In recesses where no connection unit is to be attached, a dummy piece can be inserted to protect the connection interface. If the recess is limited by the second, preferably the first, carrier element, a connection means in the form of an electrical contact may be provided on the first and/or second carrier element so that the connection unit can easily be brought into electrical contact with the heating mat.

The invention may also provide that the method comprises the following steps:

-   -   Applying an adhesive layer to a sealing layer and/or to a sound         insulation layer and/or to the base unit,     -   Fixing the sealing layer and/or the sound insulation layer to         the base unit by the adhesive layer.

The application of the adhesive layer may preferably comprise laminating the adhesive layer to the sealing layer or the sound insulation layer or the base unit. Preferably, the adhesive layer can be designed as a double-sided adhesive tape. Thus, the sealing layer and/or the sound insulation layer can be delivered as prefabricated components and can be easily attached to the base unit by means of the adhesive layer during the production of the heating mat. This can facilitate series production of the heating mat and/or simplify production. In particular, the production of the sealing layer and/or the sound insulation layer can be outsourced.

The invention may further provide that the adhesive layer comprises an adhesive tape, wherein the following step is further provided:

-   -   Scribing the adhesive tape so that two separately usable         adhesive regions are produced, wherein a first adhesive region         can be used for fixing the sealing layer and/or the sound         insulation layer on the base unit and a second adhesive region         can be used for external fixing of the heating mat.

The adhesive tape can thus simultaneously favour the possibility of connecting the base unit to the sealing layer and/or the sound insulation layer and two heating mats, which should be placed next to each other to form the surface heating system. By scribing the adhesive tape, the base unit can first be completely laminated with the adhesive tape and then, depending on the geometry of the room and/or the use of the heating mat, the adhesive regions can be adapted, in particular to the specific application. The insertion of the adhesive tape can, for example, be carried out at the construction site, while further steps can be carried out in a separate production region of the heating mat. In particular, however, by scribing the adhesive tape in the separate production environment, a standardized specification may already exist, which can still be changed and/or ignored on the construction site.

Furthermore, in the case of a method involving an invention, the method may comprise the following step:

-   -   Cutting at least the first carrier element, the second carrier         element and/or the intermediate element, in particular wherein         the cutting is carried out simultaneously with the pressing on         of the connection means and/or the counter-connection means.

In this way, for example, the outer shape of the heating mat can be specified for series production, in particular before further components are applied to the first and/or second carrier element. Preferably, the complete base unit can be cut to size, in particular preferably together with the sealing layer and/or the sound insulation layer. Thus, for example, a geometry adapted to the application case can be produced, while the upstream production can be carried out, for example, by means of a strip material, in particular as a continuous web. It is also conceivable that the cutting of the base unit is carried out in the same press tool as the pressing on of the connection means and the counter-connection means. It is thus conceivable that the outer edge of the press tool is designed as a punching tool and that press punches are provided in the inner region. In this way, different production steps can be combined in a single work step, in particular in a single stroke.

Furthermore, in the case of a method according to the invention, it may be provided that the method further comprises the following step:

-   -   Arranging at least one decentralized evaluation unit, in         particular for processing sensor data of the sensing means, on         the base unit, preferably wherein an electrically conductive         adhesive is used for an electrical contact between the         decentralized evaluation unit with a data line of the base unit

In particular, the intermediate element can comprise an opening or an opening can be cut into the intermediate element into which the decentralized evaluation unit is inserted. The decentralized evaluation unit can be arranged in the centre of the base unit. On the one hand, the electrically conductive adhesive can be used to fix the evaluation unit and on the other hand, the electrical contact between the evaluation unit and the base unit, in particular with connection sections to electrical connections, can be realized.

The invention may also provide that the method further comprises the following step:

-   -   Casting a casting compound at least partially via the base unit         and/or the decentralized evaluation unit.

The casting compound can preferably be electrically insulating. By at least partially casting the casting compound via the base unit and/or the decentralized evaluation unit, it can be ensured that no undesirable electrical contacts remain open, which could impair the functional efficiency of the heating mat in use. Preferably, the casting compound can comprise a synthetic resin or consist of a synthetic resin.

The invention may also provide for a quality control of the heating means. In particular, the quality control of the heating means may comprise the following steps:

-   -   Placing the heating mat on a conveyor means, in particular a         conveyor belt,     -   Approaching at least one connection interface and/or at least         one counter-connection interface with a probe,     -   Testing an electrical parameter, in particular the electrical         resistance,     -   Applying a voltage to the heating means and evaluating a thermal         image, in particular an infrared image, with regard to a         temperature reached,     -   Comparing the electrical parameter and/or the temperature         reached with a set-point value.

Furthermore, it is conceivable that a quality control of the sensing means is carried out in the method according to the invention. In particular, the quality control of the sensing means may comprise the following steps:

-   -   Placing the heating mat on a conveyor means or conveying the         heating mat on the conveyor means,     -   Approaching at least one sensor element and/or a decentralized         evaluation unit with a probe,     -   Positioning a test body on at least one sensor element and         storing a sensing signal,     -   Comparing the sensing signal with a reference signal.

Preferably, the conveyor means of the quality control of the sensing means and the heating means may be the same conveyor means, so that the quality control, in particular the complete quality control, can be carried out on the same conveyor means. Quality control can increase the reliability of the method for producing the heating mat, so that defective products can be identified and sorted out before installation on the construction site.

Further measures to improve the invention are described in the following description of embodiments of the invention, which are shown schematically in the figures. All features and/or advantages arising from the claims, the description or the figures, including constructional details, spatial arrangements and method steps, may be essential to the invention, both individually and in various combinations. It should be noted that the figures are only descriptive and are not intended to limit the invention in any way. The figures show the following:

FIG. 1 a schematic design of a heating mat according to the invention according to a first embodiment in schematic sectional view,

FIG. 2 a plan view of a first base side of a base unit of the inventive heating mat of the first embodiment,

FIG. 3 a schematic representation of a sensing means of the inventive heating mat of the first embodiment,

FIG. 4 a possible sensing of an event in chronological order with the heating mat of the first embodiment,

FIG. 5 the inventive heating mat of the first embodiment in a further schematic sectional view,

FIG. 6 a further sectional schematic view of the inventive heating mat of the first embodiment in the edge region,

FIG. 7 a possible bending of the heating mat of the first embodiment in schematic view,

FIG. 8 a surface heating system with a heating mat according to the first embodiment,

FIG. 9 a room in a building with a surface heating system according to the invention in a further embodiment,

FIG. 10 method steps of a method according to the invention for producing a heating mat in a further embodiment,

FIG. 11a-i the method steps of the method according to the invention of the embodiment of FIG. 10 in a further schematic representation,

FIG. 12 a schematic design of an inventive heating mat according to a further embodiment in schematic sectional view,

FIG. 13 a plan view of a heating means of the inventive heating mat according to FIG. 12,

FIG. 14 a schematic representation of a sensing means of the inventive heating mat as shown in FIG. 12,

FIG. 15 the inventive heating mat according to FIG. 12 in a further schematic sectional view,

FIG. 16a-c the inventive heating mat according to FIG. 12 with a connection unit,

FIG. 17 method steps of a method according to the invention for producing a heating mat in a further embodiment,

FIG. 18a-k the method steps of the inventive method of the embodiment of FIG. 17 in a further schematic representation.

In the following figures, identical reference signs are used for the same technical features even from different embodiments.

FIG. 1 shows a schematic design of a heating mat 4 according to the invention with a detailed view of a base unit 10 of the heating mat 4. The base unit 10 forms in particular a core of the heating mat 4. The base unit 10 comprises a first carrier element 11, which comprises a flat extension with a first and a second base side 11.1, 11.2. The first carrier element 11 is thus suitable for laying the heating mat 4, for example as part of a limiting element 110 of the room 101, in particular a floor, of a building 100. The first base side 11.1 preferably forms an underside of the first carrier element 11 if the heating mat 4 is installed as a floor heating system in the building 100. In this case, the second base side 11.2 preferably forms the upper side of the first carrier element 11. On the first base side 11.1, an electrical heating means 20 is provided for emitting heat. The electrical heating means 20 comprises a resistor element 21, which extends on the first base side 11.1 of the first carrier element 11 and is preferably designed flat, in particular plate-like. Furthermore, the electrical heating means 20 comprises a heating conductor element 23, through which the resistor element 21 is connected to an electrical connection 40 of the heating mat 4. The heating conductor element 23 and/or the resistor element 21 can be printed on the first carrier element 11. Preferably, the heating conductor element 23 is initially printed directly on the first carrier element 11 and the resistor element 21 is printed at least partially on the heating conductor element 23 and/or at least partially on the first carrier element 11. Thus, the resistor element 21, which can preferably be designed in a plate-like manner, can extend over the heating conductor element 23. The heating conductor element 23 can, for example, be provided as a narrow strip so that the resistor element 21 is partly applied directly to the heating conductor element 23 and partly applied directly to the first carrier element 11. In particular, the heating conductor element 23 and the resistor element 21 are in a firmly-bonded connection to the first carrier element 11 and/or to each other. In order to keep the electrical resistance of the heating conductor element 23 low, the heating conductor element 23 comprises in particular a noble metal, preferably silver. The resistor element 21 is designed to emit heat when it is energized. The heat emitted results in particular from the resistance of the resistor element 21. In particular, the resistor element 21 comprises a carbon paste which comprises carbon 21.1 and/or a filler 21.2. The carbon 21.1 can preferably be in ground form. The filler 21.2 also serves to adjust the conductivity of the resistor element 21, wherein the conductivity of the resistor element 21 corresponds to the quantity of filler 21.2 added to the carbon paste. For electrical insulation from the outside of the base unit 10, a first protective layer 14.1 is also provided, which at least partially covers the electrical heating means 20. In particular, the first protective layer 14.1 may comprise a resist, preferably a photoresist.

On the second base side 11.2 of the first carrier element 11, the base unit 10 comprises a capacitive sensing means 30 for detecting an event 3. The sensing means 30 comprises a data line 35, which in particular is applied directly to the first carrier element 11. The data line 35 can be used for current supply and/or data communication of the sensing means 30. For this purpose, the data line 35 can preferably comprise a plurality of, in particular parallel, data conductors, through which, for example, a data bus can be provided. The data conductors can, for example, be provided as different and separate layers or run separately from each other in a plane. Furthermore, the sensing means 30 comprises two electrodes 31, between which an electric field can be generated. In particular, the two electrodes 31 can be partially connected to the data line 35. For electrical insulation, in particular of further regions, a further protective layer 14.3 can also be provided between the electrodes 31 and the data line 35. This can ensure that the electrodes 31 and the data line 35 contact each other only in some contact sections and that the electric field is therefore not or only slightly influenced by the data line 35. Furthermore, a second protective layer 14.2 is provided for the electrical insulation of the sensing means 30 from the environment, which at least partially covers the sensing means 30. Preferably, the sensing means 30 can be applied directly or indirectly to the second base side 11.2 of the first carrier element 11. In particular, the electrodes 31 and/or the data line 35 can be connected to the first carrier element 11 in a firmly-bonded connection by a printing method. The second protective layer 14.2 as well as the further protective layer 14.3 may in particular be varnished and/or applied by a printing method, preferably as photoresist.

Due to the described design of the base unit 10, it is flexible, so that the handling of the heating mat 4 can differ from the handling of a rigid plate. This is particularly advantageous when handling on a construction site, as, for example, one person can carry the heating mat 4, the heating mat 4 can be delivered in a stack with further heating mats 4 and/or the risk of breakage of the heating mat 4 can be reduced. In particular, the base unit 10 forms a film-like, preferably moisture-impermeable composite. In order to further protect the base unit 10 from moisture, a sealing layer 60 is also arranged on the base unit 10, in particular indirectly on the second base side 11.2 of the first carrier element 11. For this purpose, an adhesive layer 70 is arranged between the base unit 10 and the sealing layer 60 to fix the sealing layer 60 to the base unit 10. Furthermore, the sealing layer 60 comprises a plurality of fibre layers 60.1, so that a tightness of the sealing layer 60 can be increased by the plurality of fibre layers 60.1. In particular, the sealing layer 60 may comprise a non-woven fabric. On the first base side 11.1 of the first carrier element 11, a sound insulation layer 50 is also attached to the base unit 10. For this purpose, an adhesive layer 70 is also provided between the sound insulation layer 50 and the base unit 10 in order to ensure a firmly-bonded connection between the base unit 10 and the sound insulation layer 50. The sound insulation layer 50 comprises a positive effect on the sound transmission, in particular when using the heating mat 4 as a floor heating system, so that impact sound is reduced. By forming the base unit 10 with the sensing means 30 in a layered compound, the base unit 10 can be laid flat for the design of a surface sensor system 1.2. By using the electrical heating means 20, the base unit 10 can be laid flat for the design of a surface heating system 1.1. In particular, this provides a double functionality of the heating mat 4, so that when the heating mat 4 is laid, the surface heating system 1.1 can be designed on the one hand and the surface sensor system 1.2 on the other hand. Thus, in particular, only one installation of the heating mat 4 is necessary in order to realize a sensor functionality on the one hand and on the other hand a heating functionality within a room 101 of the building 100. In particular, the representation of FIG. 1 only schematically comprises a region of the heating mat 4 in a sectional view, wherein the layer structure can, for example, depict a printing sequence during the production of the heating mat 4. In particular, at least the sound insulation layer 50 and/or the sealing layer 60 and/or the protective layers 14.1, 14.2, 14.3 can extend over the full surface or partially of the full surface of the heating mat 4.

FIG. 2 shows a schematic plan view of the base unit 10 of the heating mat 4 of the first embodiment on the first base side 11.1 of the first carrier element 11. It is shown that the heating mat 4 comprises a plurality of flat, in particular plate-like, resistor elements 21 in a regular distribution pattern. The resistor elements 21 are connected via heating conductor elements 23 to at least one conductor track 42, preferably a plurality of conductor tracks 42, running in an edge region 12 of the base unit 10. Via the conductor track 42, the resistor elements 21 are thereby connected to heating connections 45, which may be part of electrical connections 40, which are arranged in the edge region 12 of the base unit 10. The resistor elements 21 are located in a central region 13 of the base unit 10. The conductor track 42 is further provided circumferentially in the edge region 12. This makes it easy to adapt the heating mat 4 to a special geometry of a room 101, such as a bay window, by cutting off a sub-region of the base unit 10. Because a plurality of electrical connections 40 are provided and the conductor track 42 is formed circumferentially, at least part of the functionality of the electrical heating means 20 can thus be retained if individual resistor elements 21 and/or individual electrical connections 40 are cut off. For at least parts of the remaining resistor elements 21, preferably at least one electrical connection 40 and the corresponding contact via the conductor track 42 is retained. Thus, in particular nominal cutting lines 15 are provided, along which it is possible to cut the heating mat 4 to adapt the geometry of the room 101. The nominal cutting lines 15 are pre-printed or pre-perforated and/or result from the arrangement of the resistor elements 21 and/or sensor elements 30.1, which are shown in FIG. 3. Preferably the heating mat 4 is designed as a heating module to be connected with further heating modules for a surface heating system 1.1 and/or a surface sensor system 1.2. In order to provide a simple possibility of electrical coupling, the electrical connections 40 comprise connection interfaces 41 and/or counter-connection interfaces 43. In particular, the connection interfaces 41 can be connected with counter-connection interfaces 43 of further heating mats. For this purpose, each connection interface can comprise at least one, preferably a plurality of, connection means 90 and each counter-connection interface can comprise one, preferably a plurality of, counter-connection means 93. Preferably, the connection interface 41 and/or the counter-connection interface 43 can be designed for reversible mechanical fixing. In particular, the connection means can thus be designed as a push-button and/or the counter-connection means 93 as an eyelet. In this way, an electrical coupling of the heating mat 4 with an energy source 2 and/or a control unit 22 can be connected quickly and reliably. The connection means 90 and/or the counter-connection means 93 can preferably be glued to the base unit 10 by an electrically conductive adhesive.

In particular, a sensor element 30.1 is assigned to each resistor element 21 of the electrical heating element 20. This may also further simplify the cutting of the heating mat 4, so that cutting to size separates the same number of sensor elements 30.1 as resistor elements 21. The sensing means 30 is shown schematically in a plan view of the second base side 11.2 of the first carrier element 11 in FIG. 3. The sensing means 30 comprises the sensor elements 30.1, which each comprise two electrodes 31 to generate an electric field. Each sensor element 30.1 is connected to a decentralized evaluation unit 32. The decentralized evaluation unit 32 is also arranged in the vicinity of the respective sensor elements 30.1, so that a connecting distance between the sensor elements 30.1 and the respective evaluation unit 32 can be kept small. In particular, the decentralized evaluation unit 32 is designed to convert analogue measuring signals of the sensor elements 30.1 into digital signals. Furthermore, the decentralized evaluation units 32 are connected with a data line 35. The data line 35 also comprises a supply section 35.2 and a ring section 35.1. In particular, the ring section 35.1 is arranged at least partially parallel to the conductor track 42, circumferentially in the edge region 12 of the base unit 10. The supply section 35.2 is in particular arranged parallel to the heating conductor element 23, at least partially in the central region 13 of the base unit 10. Thus, the evaluation units 32 can be connected to the ring section 35.1 via the supply section 35.2. Preferably, each supply section 35.2 can contact the ring section 35.1 a plurality of times. This also results in an advantageous cutting of the heating mat 4, so that, for example, the functionality of remaining sensor elements 30.1 can be retained even if an upper region of the heating mat 4 is cut off. The ring section 35.1 is also connected to a plurality of data connections 36, which can be part of the electrical connections 40 for the electrical heating means 20 or can form separate electrical connections 40. In particular, the data line 35 can comprise a plurality of data lines, which run in parallel, for example to be able to transmit different data and/or to provide a bus. Furthermore, the dashed representation shows sensing regions 34 of the sensing means 30 of the heating mat 4, which can be monitored by the sensor elements 30.1.

FIG. 4 schematically shows a plurality of sensing regions 34, each of which can be generated by the sensor elements 30.1. In order, for example, to be able to detect the behaviour of a person or the presence of a person as the event 3, it may be provided to monitor the sensing regions 34 individually and, in particular, to evaluate them at different points of time T1 to T5. Thus, for example, an event 3 can be tracked in the form of a movement of a person, so that the use of the surface sensor system 1.2 of the heating mat 4 is particularly suitable for commercial applications in such a way that the behaviour of visitor flows can be analysed. In this way, it is possible to find out, for example, whether a product is particularly interesting for visitors or something similar.

FIG. 5 also shows a possible connection of the decentralized evaluation unit 32 with the sensor elements 30.1 of the sensing means 30. In particular, the decentralized evaluation unit 32 can be provided on the first base side 11.1 of the first carrier element 11, on which the electrical heating means 20 is also arranged. A connection of the sensor elements 30.1 with the decentralized evaluation unit 32 through the first carrier element 11 can be ensured in a particularly simple form by a respective passage element 37, which can be designed in particular as a rivet. This can further facilitate the series production of the heating mat 4. At the same time, the decentralized evaluation unit 32 can be fixed to the base unit 10. In particular, the evaluation unit 32 can also be advantageously embedded in the sound insulation layer 50, which can be designed to be particularly pliable and can thus provide elastic protection when the heating mat 4 is stressed, for example by the movement of a person.

FIG. 6 further shows a schematic representation of an edge region 12 of the heating mat 4 of the first embodiment. Here the base unit 10 is shown with one of the electrical connections 40. In addition, part of the adhesive layers 70 is arranged in the edge region. At least one of the adhesive layers 70 comprises a first adhesive region 71.1 as fixing interface 44 for connecting the heating mat 4 with further heating mats and/or further components of the surface heating system 1.1. Furthermore, a second adhesive region 71.2 is provided, through which the base unit 10 is connected to the sealing layer 60 and/or the sound insulation layer 50. Thus, a plurality of functions can be easily realized by the respective adhesive layer.

FIG. 7 shows the inventive heating mat 4 of the first embodiment with a possible bending. The heating mat 4 can be bent by a bending angle A. This is possible, in particular, because the base unit 10 is flexibly designed. Preferably, the achievable bending angle A can be greater than or equal to 10°, preferably greater than or equal to 45°, particularly preferably greater than or equal to 90°. The achievable bending angle can refer in particular to a horizontal, if the heating mat 4 rests at least partially, e.g. on a floor. However, a bending radius R may also be provided, which illustrates that the bending angle A is to be distinguished from a kink. In particular, the decentralized evaluation units 32 can also be rigid, so that a bending between the decentralized evaluation units 32 is possible.

FIG. 8 also shows a connection of a plurality of heating mats 4. The heating mats 4 form the surface heating system 1.1 or the surface sensor system 1.2. The heating mats 4 are connected to each other by electrical connections 40, through which an electrical coupling 40.1 can be established. The electrical coupling 40.1 can provide an energy supply and/or a data connection. One of the heating mats 4 is preferably designed as a master element 4.1, which can be directly connected to the control unit 22 in a communication connection. In particular, the master element 4.1 can comprise a temperature sensor 24 for calibrating and/or adjusting the surface heating system 1.1. It is also shown that the heating mats 4 overlap in their edge regions 12. In particular, the edge regions 12 can each comprise first adhesive regions 71.1, which can form a fixing interface 44. The fixing interfaces 44 allow the heating mats 4.1, 4.2 to be fixed in particular to each other. The control unit 22, which is connected to the master element 4.1, can also comprise a central control apparatus 33, by which preferably a heating power of the heating mats 4 and a detection of events 3 of the heating mats 4 can be controlled or evaluated. Preferably, the central control apparatus 33 can be provided in a flush-mounted box of a room 101 of a building 100.

FIG. 9 further shows a building 100 with a room 101, which can be heated by a surface heating system 1.1 and can be monitored at least partially by a surface sensor system 1.2. The monitoring of the room 101 may comprise the detection of an event 3, wherein the event 3 may preferably comprise an activity of a person. In particular, the activity of a person can be a stay of the person. In particular, the surface sensor system 1.2 can further be designed for capacitive detection of the event 3. The surface heating system 1.1 and the surface sensor system 1.2 are thereby formed by the inventive heating mat 4, preferably by a combination of a plurality of heating mats 4 according to the first embodiment. For this purpose, the heating mats 4 are arranged on a structural element 102 of a limiting element 110 of the room 101. The structural element 102 can preferably be a raw floor component. Furthermore, a functional cover 103, which can preferably be a screed, as well as a visual cover 104, which can for example comprise tiles and/or carpet and/or laminate and/or the like, are arranged on the heating mats 4. The surface sensor system 1.2 and/or the surface heating system 1.1 can be connected and/or connectable to an external computing unit 80 and/or a mobile terminal 81. In this way, for example, remote control of the surface heating system 1.1 and/or remote monitoring of the surface sensor system 1.2 by a user can also be carried out outside the building 100 and/or in another room of the building 100. Preferably, sensing regions 34 may be provided for the detection of the event 3, which, starting from sensor elements 30.1 of the heating mats 4, comprise a height H of greater than or equal to 10 mm, preferably greater than or equal to 25 mm, particularly preferably greater than or equal to 40 mm, in order to enable reliable detection of the event 3 outside the limiting element 110.

FIGS. 10 and 11 a to 11 i further show method steps 201 to 212 of a method 200 according to the invention for producing a heating mat 4 in a further embodiment. Preferably, a heating mat of the first embodiment can thus be produced. The method 200 comprises a provision 201 of a first carrier element 11, which comprises a flat extension with a first base side 11.1 and a second base side 11.2. The provision 201 of the first carrier element 11 can preferably comprise the production of a film. Furthermore, a pre-tempering 202 of the first carrier element 11 is provided in order to reduce shrinkage of the first carrier element 11 in successive method steps. The first carrier element 11 is preferably heated and/or cooled. Furthermore, the method 200 comprises a construction 203 of a flexible base unit 10. The construction 203 of the flexible base unit 10 comprises an application 204 of an electrical heating means 20 on the first base side 11.1 of the first carrier element 11. In particular, an application 201.1 of a conductor material 21.1, 21.2 of the electrical heating means 20 in at least partially liquid form on the first base side 11.1 of the first carrier element 11 can be provided. After the application of 204.1 of the conductor material 21.1, 21.2, curing 204.2 of the conductor material 21.1, 21.2 may also be provided. The curing 204.2 can preferably be accelerated by UV radiation and/or heat radiation. Thus, the application 204 of the electrical heating means 20 may comprise in particular a printing of the electrical heating means 20 on the first carrier element 11 and/or further components of the base unit 10. Furthermore, the construction 203 of the base unit 10 comprises an application 205 of a sensing means 30 for detecting an event 3 on the second base side 11.2 of the first carrier element 11, so that at least the base unit 10 can be laid flat for the design of a surface sensor system 1.2. The application 205 of the sensing means 30 can preferably be carried out analogously to the application 204 of the electrical heating means 20, wherein an application 205 of a sensor material 31.1 of the sensing means 30 is carried out in at least partially liquid form on the second base side 11.2 of the first carrier element 11 and a curing 205.2 of the sensor material 31.1 is carried out. Thus, the sensing means 30 can also be printed, in particular on the first carrier element 11. Furthermore, the construction 203 of the base unit 10 comprises an application 206 of a first protective layer 14.1 to the electrical heating means 20, in particular by varnishing, and an application 207 of a second protective layer 14.2 to the sensing means 30, in particular also by varnishing. In this way, the sensing means 30 and/or the electrical heating means 20 can be at least partially electrically insulated and/or protected from environmental conditions. In particular subsequently, the construction 208 of a connection interface 41 and/or a counter-connection interface 43 by pressing on a connection means 90 and/or a counter-connection means 93 is provided. In particular, the connection interface 41 and/or the counter-connection interface 43 may be designed to produce a reversible mechanical connection of the heating mat 4. Thus, the counter-connection means 93 can, for example, comprise an eyelet and the connection means 90 can preferably comprise a push-button, which can be connected to an eyelet. Thus, a plurality of heating mats 4 can be connected together. Advantageously, the method 200 further comprises an application 209 of an adhesive layer 70 to a sealing layer 60 and/or to a sound insulation layer 50 and/or to the base unit 10. This is followed by fixing 210 the sealing layer 60 and/or the sound insulation layer 70 to the base unit 10 by the adhesive layer 70. In order to achieve an advantageous mechanical connection of the heating mat 4 with further structural elements, the adhesive layer 70 can furthermore comprise an adhesive tape 71, which can be divided into at least two separately usable adhesive regions 71.1, 71.2 by scribing 211. Furthermore, the method 200 may comprise cutting 212 at least the first carrier element 11. It is conceivable that the composite of the base unit 10, the sealing layer 60 and the sound insulation layer 50 is cut to size together to define the external shape, so that a standard size and/or a shape of the heating mat 4 is obtained, which is adapted to the room 101. Alternatively, the cutting 212 can be carried out beforehand in the method 200, in particular before applying 207 the second protective layer 14.2 to the sensing means 30. In this way, the shape for the further method steps 208-211 can already be predetermined, so that, for example, dimensions from these method steps 208-211 can be oriented on the form. This results in a simple production method for the heating mat 4, in particular wherein the production method for the heating mat 4 can be carried out centrally at a production location separate from the construction site, in particular in series and/or partially automated.

FIG. 12 shows a schematic design of a heating mat 4 according to the invention with a detailed view of a base unit 10 of the heating mat 4. The base unit 10 forms in particular a core of the heating mat 4 with a square base area. The base unit 10 comprises a first and a second carrier element 11, which each comprise a flat extension with a first and a second base side 11.1, 11.2. Preferably at least one sealing layer 60 is arranged on the base unit 10, in particular fixed by an adhesive layer 70. The sealing layer 60 can be arranged with the adhesive layer 70 on the first and/or second carrier element 11. In addition or alternatively, a sound insulation layer 50, as shown in the first embodiment, can be arranged on the base unit 10. Thus, the first and second carrier element 11 are suitable for laying the heating mat 4, for example as part of a limiting element 110 of the room 101, in particular a floor, of a building 100. Reference is made in particular to the illustration in FIG. 9. The first base side 11.1 of the first carrier element 11 preferably forms an upper side of the first carrier element 11 when the heating mat 4 is installed as a floor heating system in the building 100. In this case, the second base side 11.2 of the first carrier element 11 correspondingly forms the lower side of the first carrier element 11 and/or the base unit 10. On the first base side 11.1 of the first carrier element 11, an electrical heating means 20 is provided for the emission of heat. The first base side 11.1 of the second carrier element 11 preferably forms an upper side of the second carrier element 11 and/or the base unit 10 if the heating mat 4 is installed in the building 100 as a floor heating system. In this case, the second base side 11.2 preferably forms the lower side of the second carrier element 11. Thus, the first base side 11.1 of the first carrier element 11 and the second base side 11.2 of the second carrier element 11 face each other. On the second base side 11.2 of the second carrier element 11 a sensing means 30 is provided for the detection of an event 3. The heating means 20 and the sensing means 30 are thus arranged between the first and second carrier element 11 and are thus at least partially protected. Furthermore, an intermediate element 16 is arranged between the first and second carrier element 11, which is preferably designed as a sound insulation layer 50. Thus, a spatial distance and/or electrical insulation between the first and second carrier element 11 is ensured by the intermediate element 16. At the same time, impact sound can be reduced by the intermediate element 16.

FIG. 13 shows a plan view of the first carrier element 11 of the base unit 10 with the electrical heating means 20. The electrical heating means 20 comprises at least one resistor element 21 which extends on the first base side 11.1 of the first carrier element 11 and is designed preferably flat, in particular plate-like. Furthermore, the electrical heating means 20 comprises at least two conductor tracks 42, through which the resistor element 21 is connected to an electrical connection 40 of the heating mat 4. The conductor tracks 42 and/or the resistor element 21 can be printed on the first carrier element 11. Preferably, the conductor tracks 42 are first printed directly on the first carrier element 11 and the resistor element 21 is printed at least partially on heating conductor elements 23 connected to the conductor tracks 42 and/or at least partially on the first carrier element 11. In particular, the conductor tracks 42, the heating conductor elements 23 and the resistor element 21 are in a firmly-bonded connection to the first carrier element 11 and/or to one another. In order to keep the electrical resistance of the heating conductor elements 23 and the conductor tracks 42 low, the heating conductor elements 23 and the conductor tracks 42 comprise in particular a noble metal, preferably silver. The resistor element 21 is designed to emit heat when it is energized. The emitted heat results in particular from the resistance of the resistor element 21. In particular the resistor element 21 comprises a carbon paste comprising carbon 21.1 and/or a filler 21.2. For the electrical insulation of the heating means 20, a first protective layer 14.1 can also be provided, as in the first embodiment, which covers the electrical heating means 20 at least partially. In particular, the heating means 20 comprises a plurality of resistor elements 21 in a regular pattern. One of the conductor tracks 42 is designed as a cross-like circumferential connection section 25. This means that electrical connections 40, which are arranged in an edge region 12 of the base unit 10, can still be used to supply energy to one of the resistor elements 21 even if the heating mat 4 is cut to size to adapt to a geometry of the room 101. One of the conductor tracks 42 also comprises a circumferential section in an edge region 12 of the base unit 10, which improves the ability to cut the heating mat 4 to size.

The sensing means 30 can preferably be designed for capacitive detection of the event 3. The base unit 10 comprises at least one data line 35, which in particular is applied directly to the first and/or second carrier element 11. As shown in FIG. 13, the data line 35 comprises connection sections 25, which extend cross-like from a decentralized evaluation unit 32 arranged centrally on the base unit 10 to the electrical connections 40. The data line 35 can be used for the current supply and/or data communication of the sensing means 30. For this purpose, the data line 35 can preferably comprise a plurality of data conductors, in particular running in parallel, through which, for example, a data BUS can be provided. FIG. 14 shows a plan view of the second carrier element 11 of the base unit 10 with the sensing means 30. Furthermore, the sensing means 30 comprises two electrodes 31, through which an electric field can be generated. One of the electrodes 31 is designed as a shield electrode for limiting the electric field and is circumferential in the edge region 12 of the base unit 10. Furthermore, a second protective layer 14.2, as shown in the embodiment in FIG. 1, can be provided to electrically insulate the sensing means 30 from the environment, wherein the second protective layer 14.2 preferably covers the sensing means 30 at least partially. In particular, the sensing means 30 is applied directly or indirectly to the second base side 11.2 of the second carrier element 11. Furthermore, the electrodes 31 and/or the data line 35 can be in a firmly-bonded connection to the second carrier element 11 by a printing method. The sensing means 30 comprises four sensor elements 30.1 for the detection of the event 3, each of which is formed by an electrode 31 and the surrounding electrode 31 in the form of the shield electrode. This creates four sensing regions 34 in particular for the detection of the event 3.

The decentralized evaluation unit 32 is connected to each of the sensor elements 30.1 of the heating mat 4. The decentralized evaluation unit 32 is also located near the respective sensor elements 30.1 due to its central arrangement, so that a connecting distance between the sensor elements 30.1 and the respective evaluation unit 32 can be kept small. In particular, the decentralized evaluation unit 32 is designed to convert analogue measuring signals of the sensor elements 30.1 into digital signals. Furthermore, a pre-evaluation of the measuring signals can be carried out by the decentralized evaluation unit 32. FIG. 15 also shows the arrangement of the decentralized evaluation unit 32 in the base unit 10 in a sectional view. The decentralized evaluation unit 32 extends at least partially into a receiving opening of the intermediate element 16. This means that the decentralized evaluation unit 32 also enables an electrical coupling between components of the first and second carrier element 11. In particular, this means that the connection sections 25 of the data line 35 can be connected to the sensing means 30 via the decentralized evaluation unit 32.

As shown in FIG. 16a , the electrical connections 40 each comprise a connection interface 41 for connecting the electrical heating means 20 and the sensing means 30 to a connection unit 96. The connection unit 96 ensures an electrical coupling between the connection interface 41 and a counter-connection interface 43, so that the electrical connection 40 allows the heating mat 4 to be connected at least indirectly to an energy source 2 and/or a control unit 22. In particular, the heating mat 4 can be connected to a further heating mat 4 and/or a network of further heating mats 4 for connection to the energy source 2 and/or the control unit 22. Accordingly, the counter-connection interface 43 can be part of the further heating mat 4. Unused electrical connections 40 can preferably be closed by a dummy piece 96.1. The connection unit 96 also comprises a flat connection body 97, as shown in FIG. 16b , and a flat fixing body 98, as shown in FIG. 16c . For the electrical coupling of the connection interface 41 and the counter-connection interface 43, the connection body 97 can be arranged in a recess 46 of the base unit 10 of the heating mat 4. In this case, the connection body 97 comprises a first and a second contact section 97.1, 97.2 which are electrically coupled to each other. In order to ensure separate contacting of the sensing means 30 and the heating means 20, the first and second contact sections 97.1, 97.2 each comprise at least one first contact element 97.3 and one second contact element 97.4, wherein the first contact elements 97.3 and second contact elements 97.4 each are separately connected to one another. The connection interface 41 further comprises two connection means 90 in the form of electrical contacts on the first base side 11.1 of the first carrier element 11. The counter-connection interface 43 comprises two analogously designed counter-connection means 93 in the form of electrical contacts. Thus, two similar interfaces 41, 43 can be easily connected legitimate to the construction site by the connection unit 96. To simplify the fixing of the connection unit 96, a fixing body 98 is further provided. It can be arranged on a side of the first carrier element 11 opposite the connection body 97. Furthermore, the fixing body 98 comprises magnets 99 which can be brought into operative connection with the contact elements 97.3. In particular, the contact elements 97.3 can be magnetised for this purpose. If the fixing body 98 and the connection body 97 are thus arranged in such a way that the first carrier element 11 is arranged between the fixing body 98 and the connection body 97, the first carrier element 11 is clamped by the connection unit 96. At the same time, the magnets 99 cause a magnetic force on the contact elements 97.3, so that the contact elements 97.3 are pressed against the connection means 90 or the counter-connection means 93. On the one hand, this results in a force-locking fixation of the connection unit 96 to the heating mat 4 and on the other hand in a reliable contacting. For a form-fitting connection and correct positioning of the connection unit 96, the fixing body 98 also comprises at least one positioning aid 98.1 in the form of projections, the connection body 97 comprises at least one counter-positioning aid 97.5 and the connection interface 41 comprises at least one alignment means 41.1. When fixing the connection unit 96 to the connection interface, the positioning aid 98.1 acts together with the counter-positioning aid 97.5 and the alignment means 41.1 so that a form-fitting connection is produced. In addition, the clever arrangement and design of the positioning aid 98.2, the counter-positioning aid 97.5 and the alignment means 41.1 prevents incorrect positioning of the connection unit 96.

FIGS. 17 and 18 a to 11 k further show method steps of a method 200 according to the invention for producing a heating mat 4 in a further embodiment. Preferably, a heating mat of the embodiment shown in FIGS. 12 to 16 can be produced by this method. The method 200 comprises a provision 201 of a first carrier element 11 and a provision 213 of a second carrier element 11, each of which comprises a flat extension with a first base side 11.1 and a second base side 11.2. The provision 201, 213 of the carrier elements 11 can preferably each comprise the production of a film. Preferably, cutting to size 212 can be done after the first and second carrier elements 11 have been provided. In this way, the shape for the further method steps can already be predetermined, so that, for example, dimensions from these method steps can be oriented on the form. This results in a simple production method for the heating mat 4, in particular wherein the production method for the heating mat 4 can be carried out centrally at a production location separate from the construction site, in particular in series and/or partially automated. Furthermore, a pre-tempering 202 of the first and second carrier element 11 is provided in order to reduce shrinkage of the carrier elements 11 in successive method steps. The carrier elements 11 are preferably heated and/or cooled.

Furthermore, the method 200 comprises a construction 203 of a flexible base unit 10. The construction 203 of the flexible base unit 10 comprises an application 204 of an electrical heating means 20 on the first base side 11.1 of the first carrier element 11. In particular, an application 204.1 of a conductor material 21.1, 21.2 of the electrical heating means 20 in at least partially liquid form on the first base side 11.1 of the first carrier element 11 can be provided. After the application 204.1 of the conductor material 21.1, 21.2, a curing 204.2 of the conductor material 21.1, 21.2 can also be provided. The curing 204.2 can preferably be accelerated by UV radiation and/or heat radiation. Thus, the application 204 of the electrical heating means 20 may comprise in particular a printing of the electrical heating means 20 on the first carrier element 11 and/or further components of the base unit 10. Furthermore, the construction 203 of the base unit 10 comprises an application 205 of a sensing means 30 for detecting an event 3 on the second base side 11.2 of the second carrier element 11, so that at least the base unit 10 can be laid flat for the design of a surface sensor system 1.2. The application 205 of the sensing means 30 can preferably be carried out analogously to the application 204 of the electrical heating means 20, wherein an application 205.1 of a sensor material 31.1 of the sensing means 30 is carried out in at least partially liquid form on the second base side 11.2 of the second carrier element 11 and a curing 205.2 of the sensor material 31.1 is carried out. Thus, the sensing means 30 can be printed in particular on the second carrier element 11. Furthermore, the construction 203 of the base unit 10 may comprise an application 206 of a first protective layer 14.1 to the electrical heating means 20 and an application 207 of a second protective layer 14.2 to the sensing means 30, as shown in FIGS. 10 and 11 e, in order to ensure, at least partially, an electrical insulation and/or protection against environmental conditions. In addition, the first and second carrier elements 11 are fixed 214 to one another by arranging 214.1 an intermediate element 16 between the first and second carrier elements 11 and the intermediate element 16 is fixed to the carrier elements 11 in each case by an adhesive layer 70, which can preferably be in the form of a double-sided adhesive tape 71. Furthermore, the method 200 comprises the construction 208 of a connection interface 41 by cutting a recess 46, into which a connection unit 96 can be inserted, into the base unit 10. Thereby, the recess 46 is at least partially limited by the first carrier element 11, as shown, for example, in FIG. 16a . In particular, the connection interface 41 may be designed to create a reversible mechanical connection between the heating mat 4 and the connection unit 96.

Furthermore, the method 200 comprises an arrangement 215 of at least one decentralized evaluation unit 32 on the base unit 10 for processing sensor data of the sensing means 30. For this purpose, the decentralized evaluation unit 32 is electrically and mechanically connected to a data line 35 of the base unit 10 by means of an electrically conductive adhesive. It is advantageous that casting 216 of a casting compound 14.4 can then be carried out at least partially via the base unit 10 and/or the decentralized evaluation unit 32 in order to electrically insulate any open contacts that may still be present. Preferably, the method 200 further comprises applying 209 an adhesive layer 70 to a sealing layer 60 and/or to a sound insulation layer 50 and/or to the base unit 10. It is followed by fixing 210 the sealing layer 60 and/or the sound insulation layer 70 to the base unit 10 by the adhesive layer 70. In order to achieve an advantageous mechanical connection of the heating mat 4 with further structural elements, the adhesive layer 70 can furthermore comprise an adhesive tape 71, which can be divided by scribing 211 to at least two separately usable adhesive regions 71.1, 71.2. Furthermore, the method 200 may comprise cutting 212 at least the first and/or second carrier element 11. It is conceivable that the composite of the base unit 10, the sealing layer 60 and the sound insulation layer 50 is cut to size together to define the external shape, so that a standard size and/or a shape adapted to the room 101 of the heating mat 4 is obtained. Additionally or alternatively, the intermediate element 16 can be designed as a sound insulation layer 50.

The above explanation of the embodiments dictates the present invention exclusively in the context of examples. Of course, individual features of the embodiments can be freely combined with each other, if technically reasonable, without leaving the scope of the present invention.

LIST OF REFERENCE SIGNS

1.1 floor heating system

1.2 surface sensor system

2 energy source

3 event

4 heating mat

4.1 master element

10 base unit

11 carrier element

11.1 first base side

11.2 second base side

12 edge region

13 central region

14.1 first protective layer

14.2 second protective layer

14.3 further protective layer

14.4 casting compound

15 nominal cutting line

16 intermediate element

20 electrical heating means

21 resistor element

21.1 carbon

21.2 filler

22 control unit

23 heating conductor element

24 temperature sensor

25 connection section

30 sensing means

30.1 sensor element

31 electrode

31.1 sensor material

32 decentralized evaluation unit

33 central control apparatus

34 sensing region

35 data line

35.1 ring section

35.2 supply section

36 data connection

37 passage element

40 electrical connection

40.1 electrical coupling

41 connection interface

41.1 alignment means

42 conductor track

43 counter-connection interface

44 fixing interface

45 heating connection

46 recess

50 sound insulation layer

60 sealing layer

60.1 fibre layer

70 adhesive layer

71 adhesive tape

71.1 first adhesive region

71.2 second adhesive region

80 external computing unit

81 mobile terminal

90 connection means

93 counter-connection means

96 connection unit

97 connection body

97.1 first contact section

97.2 second contact section

97.3 first contact element

97.4 second contact element

97.5 counter-positioning aid

98 fixing body

99 magnet

100 building

101 room

102 structural element

103 functional cover

104 visual cover

110 limiting element

200 method for producing a heating mat

A bending angle

R bending radius

T1-Tn points of time 

1. A heating mat for a surface heating system, comprising a flexible base unit with a first carrier element, which comprises a flat extension with a first base side and a second base side, and at least one electrical heating means for emitting heat, wherein the electrical heating means is arranged on the first base side of the first carrier element in such a way that the base unit can be laid flat for a design of the surface heating system.
 2. The heating mat according to claim 1, wherein the electrical heating means is in a firmly-bonded connection to the first carrier element.
 3. The heating mat according to claim 1, wherein the electrical heating means comprises at least one resistor element which extends on the first base side of the first carrier element.
 4. The heating mat according to claim 3, wherein the resistor element comprises a cured carbon paste.
 5. The heating mat according to claim 1, wherein the base unit is bendable, wherein an achievable bending angle of the base unit is greater than or equal to 10°.
 6. The heating mat according to claim 1, wherein the heating mat forms a heating module which can be connected together with further heating modules for the design of the surface heating system.
 7. The heating mat according to claim 1, wherein a sensing means is provided for detecting an event.
 8. The heating mat according to claim 1, wherein the base unit comprises a second carrier element on which the sensing means is arranged.
 9. The heating mat according to claim 1, wherein an intermediate element is arranged between the first and second carrier element, by means of which the first carrier element is at least partially spaced apart from the second carrier element.
 10. The heating mat according to claim 1, wherein the sensing means is in a firmly-bonded connection to at least the first or second carrier element.
 11. The heating mat according to claim 1, wherein the sensing means comprises at least two sensor elements each having a sensing region.
 12. The heating mat according to claim 1, wherein the sensing means comprises at least one electrode for capacitive detection of the event.
 13. The heating mat according to claim 1, wherein the sensing means comprises an electrode which is designed as a shield electrode for limiting an electric field.
 14. The heating mat according to claim 1, wherein at least the first or second carrier element comprises a plastic or consists of a plastic.
 15. The heating mat according to claim 1, wherein a temperature sensor is provided for at least calibrating or adjusting the electrical heating means.
 16. The heating mat according to claim 1, wherein a sound insulation layer is arranged on the base unit.
 17. The heating mat according to claim 1, wherein a sealing layer is arranged on the base unit.
 18. The heating mat according to claim 1, wherein at least the sealing layer or the sound insulation layer is fixed to the base unit with an adhesive layer.
 19. The heating mat according to claim 1, wherein at least the electrical heating means is at least partially covered by a first electrically insulating protective layer or the sensing means is at least partially covered by a second electrically insulating protective layer.
 20. The heating mat according to claim 1, wherein the base unit comprises at least one electrical connection.
 21. The heating mat according to claim 1, wherein the electrical comprises a connection interface for connecting at least the electrical heating means or the sensing means to a connection unit for connecting the connection interface to a counter-connection interface.
 22. The heating mat according to claim 1, wherein the connection interface comprises a recess in the base unit for receiving the connection unit.
 23. The heating mat according to claim 1, wherein the electrical connection comprises at least a heating connection, which is connected to the electrical heating means, or a data connection, which is connected to the sensing means.
 24. The heating mat according to claim 1, wherein the electrical connection is arranged in an edge region of the base unit.
 25. The heating mat according to claim 1, wherein the electrical heating means comprises a heating conductor element by means of which the resistor element is connected to the conductor track.
 26. The heating mat according to claim 1, wherein the conductor path is in a firmly-bonded connection to the first carrier element.
 27. The heating mat according to claim 1, wherein the conductor path is arranged circumferentially on the first carrier element.
 28. The heating mat according to claim 1, wherein at least a plurality of sensor elements of the sensing means are arranged in a regular distribution pattern or a plurality of resistor elements of the electrical heating means are arranged in a regular distribution pattern.
 29. The heating mat according to claim 1, wherein the sensing means is connected to at least one decentralized evaluation unit.
 30. The heating mat according to claim 1, wherein at least the sensing means or the decentralized evaluation unit can be connected to a central control apparatus.
 31. The heating mat according to claim 1, wherein the decentralized evaluation unit is arranged on the first base side or the second base side of the first carrier element on the base unit.
 32. The heating mat according to claim 1, wherein the base unit comprises at least one data line (which is in communication connection at least with the sensing means or with the decentralized evaluation unit.
 33. The heating mat according to claim 1, wherein at least the decentralized evaluation unit extends at least partially into a receiving opening of the intermediate element or at least one sensor element of the sensing means is connected to the data line by the decentralized evaluation unit.
 34. The heating mat according to claim 1, wherein at least the decentralized evaluation unit or the heating means is electrically coupled to the electrical connection by a connection section.
 35. The heating mat according to claim 1, wherein a plurality of electrical connections are arranged in an edge region of the base unit.
 36. The heating mat according to claim 1, wherein the data line comprises a ring section which runs at least partially circumferentially around a central region of the base unit.
 37. The heating mat according to claim 1, wherein the data line is connected to a data connection which is accessible from outside the base unit.
 38. The heating mat according to claim 1, wherein the data line is connected via the ring section to a plurality of data connections which are arranged in an edge region of the base unit.
 39. The heating mat according to claim 1, wherein at least the electrical heating means or the conductor track or the data line or the sensing means comprise a noble metal.
 40. The heating mat according to claim 1, wherein at least one nominal cutting line is provided along which it is possible to cut the heating mat for adaptation to a geometry of the room without completely destroying the function of at least the heating means or the sensing means.
 41. A surface heating system for heating a room of a building, wherein at least one heating mat for a surface heating system comprising a flexible base unit with a first carrier element, which comprises a flat extension with a first base side and a second base side, and at least one electrical heating means for emitting heat, wherein the electrical heating means is arranged on the first base side of the first carrier element in such a way that the base unit can be laid flat for a design of the surface heating system is laid flat on a structural element (102) of the building (100).
 42. A method for producing a heating mat for a surface heating system comprising the following steps: Providing a first carrier element, which comprises a flat extension with a first base side and a second base side, Constructing a flexible base unit, wherein an application of an electrical heating means is carried out on the first base side of the first carrier element, so that at least the base unit can be laid flat for the design of the surface heating system.
 43. The method according to claim 42, wherein the application of the electrical heating means on the first base side of the first carrier element comprises the following steps: Applying a conductor material of the electrical heating means in at least partially liquid form on the first base side of the first carrier element, Curing the conductor material.
 44. The method according to claim 42, wherein the method comprises the following steps: Providing a second carrier element, which comprises a flat extension with a first base side and a second base side, Fixing the first and second carrier elements together.
 45. The method according to claim 42, wherein the fixing of the first and second carrier elements together comprises the arrangement of an intermediate element between the first and second carrier elements.
 46. The method according to claim 42, wherein the following step is carried out before the application of the electrical heating means: Pre-tempering at least the first or second carrier element.
 47. The method according to claim 42, wherein the construction of the base unit comprises the following step: Applying a sensing means for detecting an event on the second base side of at least the first carrier element or on the second carrier element, so that at least the base unit can be laid flat for the design of a surface sensor system .
 48. The method according to claim 42, wherein the construction of the base unit comprises at least one of the following steps: At least applying a first protective layer to the electrical heating means or Applying a second protective layer to the sensing means.
 49. The method according to claim 42, wherein the application of the sensing means comprises the following steps: Applying a sensor material of the sensing means in at least partially liquid form on the second base side of at least the first or second carrier element, Curing the sensor material.
 50. The method according to claim 42, wherein the method further comprises at least one of the following steps: At least constructing at least one connection interface by pressing on a connection means or a counter-connection interface by pressing on a counter-connection means or Constructing a connection interface by cutting a recess, into which a connection unit can be inserted, into the base unit.
 51. The method according to claim 42, wherein the method comprises the following steps: Applying an adhesive layer at least to a sealing layer or to a sound insulation layer or to the base unit, Fixing at least the sealing layer or the sound insulation layer to the base unit by the adhesive layer.
 52. The method according to claim 51, wherein the adhesive layer comprises an adhesive tape, wherein the following step is further provided: Scribing the adhesive tape so that two separately usable adhesive regions are produced, wherein a first adhesive region can be used for fixing at least the sealing layer or the sound insulation layer on the base unit and a second adhesive region can be used for external fixing of the heating mat.
 53. The method according to claim 42, wherein the method further comprises the following step: At least cutting at least the first carrier element, the second carrier element or the intermediate element.
 54. The method according to claim 42, wherein the method further comprises the following step: Arranging at least one decentralized evaluation unit on the base unit.
 55. The method according to claim 42, wherein the method further comprises the following step: Casting a casting compound at least partially via at least the base unit or the decentralized evaluation unit. 